I looked inside of an old cassette deck that I have TEAC V 307 to put a belt back on the capstan flywheel. I suspected correctly that the belt was slipping. the belt is old and i will replace with a new one, however, now when i turn the power on the DC motor ( connected to the capstan flywheel via this belt) turns continuously regardless of what 'play status' that I'm selecting. In fact it turns continuously even if no status is selected. I'm wondering if this is normal. when i hit FF, REV, Play, REcord, they all work correctly, its just that the DC motor is continuously turning independent of any play status. I don't remember it doing that when I opened the deck but then again I didn't have the power on when I opened it up.
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The belts are universal in most of the machines and it goes around the motor and the capstans in the twin deck. What is needed is to thread the beld and manually turn the motor to see the direction of movement of the capstan. Removal of the machanism is to be done with care and refixing of the back plate to the capstan and motor.
in most cases yes: each deck probably has a flat belt that has aged and does not offer the correct tension to the capstan drive. all parts that touch the belt must be cleaned with alcohol; the capstan pressure roller probably needs cleaning also. usually have to remove some parts/screws to be able to take out/install the belt. replacement belt must be about 1/2 inch shorter in circumference than what you remove. of course power/batteries must be removed before opening case. be gentle when replacing screws and note the types and lengths as these are removed to make sure they go back in same place - low cost belts available on internet after searching ($1 - 3$)
Hi. Make sure the flywheel turns freely and that the capstan pin and pressure roller are clean. If this is OK then it is more than likely that the belt is stretched, dried out or generally worn. These parts only have a certain usable life and are quite cheap to replace.
I'm not sure why you are unable to see the usb device, but I am
surprised you are using a speaker level output to connect to it and not
a line level, which is a much smaller signal. I've never heard of an
RCA to USB adapter, but I like the idea if it works. I normaly
just go into the line input jack on the back when using a desktop
computer. Does your laptop have a line input jack? Good
If the motor is running but the belts are not, then they are probably shot. You can buy belts by size or buy a belt kit at MCM Electronics.
If the motor is not running it could be 2 things: 1. A bad motor or voltage to the motor.... 2. A bind. I've seen the grease on the capstan bushing get old enough to turn into a very hard tar. So check the motor and capstan for freedom of movement.
Motor speed needs to be regulated by PWM. Reducing the current (with a resistor) actually lowers the torque - which, with a given load, does result in reduced speed - however, different length tapes (60min vs 90min), as well as different quality, and even current position in the tape, will change the load and hence the speed.
You need to regulate the speed via PWM. It's sometimes done on a small board built into the motor, in which case you'd have a round hole into which you could insert an INSULATED screwdriver (tiny flathead wrapped most of the way in electrical tape works).
It may be done on the main board, in which case you could find a pot conveniently labeled "motor speed", or perhaps "pulse width" or "pwm" or something to that effect. Find it, mark its current position just in case, and turn it to see if it gets the effect you're after.
And there are some tape decks in the world with no speed adjust - they are designed with a specific speed motor and the sizes of the wheels and gears are calculated for that speed.
Also there may be a mechanical fault/malfunction causing the speed problem.
An initial check and thorough cleaning of the capstan and pinch roller should be done. If there is a buildup of tape oxide or a piece of a broken tape wrapped around the capstan, the tape travel will be too fast (do to the effective increase in capstan shaft diameter).
If the pinch roller isn't fully engaging, the tape can be getting pulled onto the takeup spool at a speed faster than the capstan control.
A different source of trouble might be a slip clutch (possibly an
idler/clutch assembly)which is binding, or otherwise not functioning the way it should.
Another type of motor doesn't have it's speed controlled by an internal or external voltage.. instead, the motor has an internal centrifugal speed controller. This type of motor can be found on older tape decks, and might not have been utilized more recently.
Sounds like another case of a slipping belt. A belt usually runs off the flywheel and actually lifts the head assembly into the play or record mode. Due to the pressure involved it's either that belt or the main drive belt which is slipping or completely snapped.
Firstly: do not think about forcing the cassette door!
Look inside the unit. You need to hand rotate the capstan flywheel a
bit,( a large-ish metal disc attached to the motor via a rubber drive belt.)That should release the powered deck mechanism and allow
Then buy a new drive belt , so that problem does not recurr.